US11946974B2 - Parallel battery relay diagnostic device and method - Google Patents

Parallel battery relay diagnostic device and method Download PDF

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US11946974B2
US11946974B2 US17/626,678 US202017626678A US11946974B2 US 11946974 B2 US11946974 B2 US 11946974B2 US 202017626678 A US202017626678 A US 202017626678A US 11946974 B2 US11946974 B2 US 11946974B2
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switch
battery
battery packs
state
cell module
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US20220260637A1 (en
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Jong Il Park
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LG Energy Solution Ltd
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LG Energy Solution Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
    • G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/488—Cells or batteries combined with indicating means for external visualization of the condition, e.g. by change of colour or of light density
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
    • H01M50/512—Connection only in parallel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/569—Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present disclosure relates to a device and method for diagnosing a relay of a plurality of battery packs connected in parallel.
  • the secondary battery is a battery capable of recharging and discharging, and in its meaning, includes all of the existing Ni/Cd battery, the Ni/MH battery, and the like and a recent lithium-ion battery.
  • lithium-ion batteries have the advantage of having much higher energy density than the existing Ni/Cd batteries and Ni/MH batteries.
  • lithium-ion batteries may be manufactured in a small size and light weight, and accordingly, may be used as power sources for mobile devices.
  • the lithium-ion batteries have expanded their range of use to power sources for electric vehicles, making the batteries attract attention as a next-generation energy storage medium.
  • the secondary battery is generally used as a battery pack including a battery module in which a plurality of battery cells are connected in series and/or in parallel.
  • the state and operation of the battery pack are managed and controlled by a battery management system.
  • the battery pack uses a pre-charge circuit that includes a pre-charge relay and a pre-charge resistor to protect a positive relay.
  • the pre-charge circuits are redundantly used, resulting in an increase in manufacturing cost and unnecessarily complex control logic to be applied.
  • the present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide a battery relay diagnostic device and method capable of reducing cost and simplifying a control logic by minimizing a configuration of a pre-charge circuit of battery packs connected in parallel, and preventing misdiagnosis by performing diagnosis according to a state of each relay in consideration of the effect of interference from other battery packs connected in parallel.
  • a battery relay diagnostic device for diagnosing a battery system including a plurality of battery packs connected in parallel, and a charge and discharge controller connected between the plurality of battery packs and a load part and controlling charge and discharge of the plurality of battery packs
  • the battery pack includes a battery cell module including a plurality of battery cells, and a switching unit including a first switch provided between a positive ((+)) terminal of the battery cell module and a load part and a second switch provided a negative (( ⁇ )) terminal of the battery cell module and the load part
  • the battery relay diagnostic device includes a switching controller controlling a current applied to the battery cell module by controlling on/off of the switching unit and a diagnostic unit performing diagnosis on the first switch and the second switch based on an on/off state of the first switch and the second switch.
  • a battery relay diagnostic method is a diagnostic method for a battery system including a plurality of battery packs, the battery system including a charge and discharge controller connected between the battery packs connected in parallel and a load part and controlling charge and discharge of battery cell modules included in the battery packs, and the battery packs including the battery cell module including a plurality of battery cells and a switching unit including a first switch provided between a positive ((+)) terminal of the battery cell module and the load part and a second switch provided between a negative (( ⁇ )) terminal of the battery cell module and the load part, and the method includes performing diagnosis on the first switch and the second switch based on an on/off state of the first switch and the second switch.
  • the battery relay diagnostic device and method it is possible to reduce cost and simplify control logic by minimizing the configuration of the pre-charge circuit of battery packs connected in parallel, and to prevent misdiagnosis by performing diagnosis according to a state of each relay in consideration of the effect of interference from other battery packs connected in parallel.
  • FIG. 1 a block diagram illustrating a configuration of a single battery control system.
  • FIG. 2 is a block diagram illustrating a configuration of a battery system including a battery relay diagnostic device according to an embodiment of the present disclosure.
  • FIG. 3 A is a diagram illustrating a relay configuration of a battery system in the related art
  • FIG. 3 B is a diagram illustrating a relay control method for the battery system in the related art.
  • FIG. 4 A is a diagram illustrating a relay configuration of a battery system according to an embodiment of the present disclosure and an interference when relays are off
  • FIG. 4 B is a diagram illustrating a relay control method for the battery system when positive and negative relays are off.
  • FIG. 5 A is a diagram illustrating a relay configuration of a battery system according to an embodiment of the present disclosure and an interference when relays are on
  • FIG. 5 B is a diagram illustrating a relay control method for the battery system when positive and negative relays are on.
  • FIG. 6 is a flowchart illustrating a battery relay diagnostic method according to an embodiment of the present disclosure.
  • FIG. 7 is a diagram illustrating a hardware configuration of a battery relay diagnostic device according to an embodiment of the present disclosure.
  • first”, “second”, “the first”, or “the second” may modify various components, regardless of order and/or importance, but do not limit the components.
  • a first element could be termed a second element, and similarly, in reverse, a second element could be termed a first element.
  • FIG. 1 is a block diagram illustrating a configuration of a single battery control system.
  • a battery control system including a battery pack 1 according to an embodiment of the present disclosure and an upper-level controller 2 included in an upper-level system is schematically illustrated.
  • the battery pack 1 may be made of one or more battery cells, and may include a rechargeable battery module 10 , a switching unit 14 connected to a (+) terminal or a ( ⁇ ) terminal of the battery module 10 in series to control a charge and discharge current flow of the battery module 10 , and a battery management system 20 for controlling and managing by monitoring voltage, current, temperature, or the like of the battery pack 1 to prevent over-charging, over-discharging, or the like.
  • the switching unit 14 is a switching element for controlling a current flow for charging or discharging of the battery module 10 , and generally uses a relay, but may include a semiconductor switching element.
  • a relay for example, at least one relay or one metal-oxide-semiconductor field-effect transistor (MOSFET) may be used.
  • MOSFET metal-oxide-semiconductor field-effect transistor
  • the battery management system (BMS) 20 may monitor the voltage, current, temperature, or the like, of the battery pack 1 in order to ensure the safety of the battery, and to this end, may directly receive the values or use a sensor 12 to measure the current, voltage, temperature, or the like, of the battery pack.
  • the BMS 20 may be an interface for receiving values obtained by measuring the above-mentioned various parameters, and may include a plurality of terminals, a circuit connected to the terminals to process input values, or the like.
  • the BMS 20 may control ON/OFF of the switching element 14 , for example, a relay or a MOSFET, and may be connected to the battery module 10 to monitor the status of the battery module 10 .
  • the switching element 14 for example, a relay or a MOSFET
  • the upper-level controller 2 may transmit a control signal for the battery module to the BMS 20 . Accordingly, the operation of the BMS 20 may be controlled based on the signal applied from the upper-level controller.
  • the battery cell described in the present disclosure may be included in a battery pack used in an energy storage system (ESS), a vehicle, or the like. However, it is not limited to the above-mentioned uses.
  • the configuration of the battery pack 1 and the configuration of the BMS 20 are known, and thus a more detailed description will be omitted.
  • FIG. 2 is a block diagram illustrating a configuration of a battery system including a battery relay diagnostic device according to an embodiment of the present disclosure.
  • a battery system 200 may include a plurality of battery packs 210 , a charge and discharge controller 220 , and a battery relay diagnostic device 230 .
  • the plurality of battery packs 210 may be connected in parallel, and each may be connected to the charge and discharge controller 220 . Only one charge and discharge controller 220 may be provided regardless of the number of battery packs 210 connected in parallel.
  • each of the battery packs 210 may include a battery cell module 212 and a switching unit 214 .
  • the battery cell module 212 may include a plurality of battery cells connected in series or in parallel.
  • the switching unit 214 may include a first switch provided between a (+) terminal of the battery cell module 212 and a load part and a second switch provided between a ( ⁇ ) terminal of the battery cell module and the load part.
  • the charge and discharge controller 220 may control charge and discharge of a plurality of battery packs 210 connected in parallel.
  • the charge and discharge controller 220 may include a charge/discharge switching unit 222 and a pre-charge unit 224 .
  • the charge and discharge controller 220 may include only one pre-charge circuit.
  • the charge/discharge switching unit 222 may include a positive relay connected to the (+) side of the battery pack 210 connected to others in parallel and a negative relay connected to the ( ⁇ ) side of the battery pack 210 connected to others in parallel.
  • the charge/discharge switching unit 222 may control the positive relay and the negative relay to control a current flow applied between the battery pack 210 and a load part.
  • the pre-charge unit 224 may include a pre-charge circuit in which a pre-charge resistor and a pre-charge relay are connected in series, and may be connected in parallel to the positive relay of the charge/discharge switching unit 222 .
  • the pre-charge unit 224 may protect the positive relay by controlling a speed during initial charging of the battery pack 210 .
  • the battery relay diagnostic device 230 may diagnose the battery pack 210 included in the battery pack 210 about whether it operates normally.
  • the battery relay diagnostic device 230 may include a switching controller 232 , a diagnostic unit 234 , and an alarm unit 236 .
  • the switching controller 232 may control the current applied to the battery cell module 212 by controlling on/off of the switching unit 214 and the charge/discharge switching unit 222 of the battery pack 210 . That is, according to the present disclosure, by diagnosing the switching unit 214 of the battery pack 210 , the switching controller 232 may control on/off of the first switch provided between the (+) terminal of the battery cell module 212 and the load part and the second switch provided between the ( ⁇ ) terminal of the battery cell module and the load part, thereby controlling the current applied to the battery cell module 212 , and the diagnostic unit 234 may diagnose the first switch and the second switch about whether they operate normally.
  • the diagnostic unit 234 may perform diagnosis on the first switch and the second switch based on the on/off states of the first switch and the second switch.
  • the diagnostic unit 234 may perform diagnosis on the first switch and the second switch in an order determined in consideration of interference between the plurality of battery packs 210 connected in parallel as will be described later.
  • the diagnostic unit 234 may perform diagnosis by simultaneously measuring a voltage across the first switch for the plurality of battery packs 210 when both the first switch and the second switch are in an off state, and may perform diagnosis by sequentially measuring a voltage across a terminal of the first switch close to a (+) side of the battery cell module 212 and a terminal of the second switch close to the load part for each of the plurality of battery packs 210 .
  • the diagnostic unit 234 may perform diagnosis by simultaneously measuring the voltage across the terminal of the first switch close to the (+) side of the battery cell module 212 and the terminal of the second switch close to the load part for the plurality of battery packs 210 when the first switch is in the off state and the second switch is in the on state. In addition, the diagnostic unit 234 may perform diagnosis by sequentially measuring the voltage across the first switch for each of the plurality of battery packs when both the first switch and the second switch are in the on state.
  • the alarm unit 236 may generate a warning notification when it is determined that an abnormality occurs in at least one of the first switch and the second switch of the plurality of battery packs 210 by the diagnostic unit 234 .
  • the battery relay diagnostic device of the present disclosure it is possible to reduce cost and simplify control logic by minimizing the configuration of the pre-charge circuit of battery packs connected in parallel, and to prevent misdiagnosis by performing diagnosis depending on a state of each relay in consideration of the effect of interference from other battery packs connected in parallel.
  • FIG. 3 A is a diagram illustrating a relay configuration of a battery system in the related art
  • FIG. 3 B is a diagram illustrating a relay control method for the battery system in the related art.
  • the battery system in the related art generally includes a single pack structure and eliminates the pre-charge circuit to reduce costs. Therefore, as illustrated in FIG. 3 B , the battery management system (BMS) performs diagnosis on relays by measuring the voltages at each of points A, B, and C after waking up, regardless of the on/off state of each relay.
  • BMS battery management system
  • FIG. 4 A is a diagram illustrating a relay configuration of a battery system according to an embodiment of the present disclosure and an interference when relays are off
  • FIG. 4 B is a diagram illustrating a relay control method for the battery system when the first switch and the second switch are off.
  • interference may occur between battery packs connected in parallel, and diagnosis is performed by classifying each battery pack according to the on/off state of the relay.
  • the battery pack voltage is applied to points A of a first pack and a second pack of FIG. 4 A and a B voltage is OV, which does not affect both battery packs, and thus the measurement of the B voltage may be simultaneously performed for a plurality of battery packs.
  • FIG. 5 A is a diagram illustrating a relay configuration of a battery system according to an embodiment of the present disclosure and an interference when relays are on
  • FIG. 5 B is a diagram illustrating a relay control method for the battery system when the first switch and the second switch are on.
  • a C voltage and a D voltage of a first pack and a second pack of FIG. 5 A are ground voltages and OV is applied, which does not affect the battery packs, and thus the measurement of the C voltage may be simultaneously performed for a plurality of battery packs.
  • the battery relay diagnostic device As described above, with the battery relay diagnostic device according to an embodiment of the present disclosure, it is possible to solve the problem of misdiagnosis by the influence between battery packs by performing diagnosis simultaneously or sequentially in consideration of interference by the on/off states of the relays of each battery pack.
  • FIG. 6 is a flowchart illustrating a battery relay diagnostic method according to an embodiment of the present disclosure.
  • a battery relay diagnostic method is a diagnostic method for a battery system including a charge and discharge controller connected between a plurality of battery packs connected in parallel and a load part and controlling charge and discharge of battery cell modules included in the battery packs, and the battery packs including the battery cell module including a plurality of battery cells and a switching unit including a first switch provided between a positive (+) terminal of the battery cell module and the load part and a second switch provided between a negative ( ⁇ ) terminal of the battery cell module and the load part.
  • the charge and discharge controller may include only one pre-charge circuit.
  • the battery relay diagnostic method may be a diagnostic method of performing diagnosis based on the on/off state of relays included in the battery pack (e.g., whether or not there is interference between the battery packs).
  • a voltage across the first switch are simultaneously measured for the plurality of battery packs when both the first switch and the second switch are open and are in the off state (S 610 ).
  • the battery relay diagnostic method may include generating a warning notification when the diagnostic unit determines that an abnormality occurs in at least one of the first switch and the second switch in the plurality of battery packs.
  • the battery relay diagnostic method of the present disclosure it is possible to reduce cost and simplify control logic by minimizing the configuration of the pre-charge circuit of battery packs connected in parallel, and to prevent misdiagnosis by performing diagnosis according to a state of each relay in consideration of the effect of interference from other battery packs connected in parallel.
  • FIG. 7 is a diagram illustrating a hardware configuration of a battery relay diagnostic device according to an embodiment of the present disclosure.
  • a battery relay diagnostic device 700 may include a microcontroller (MCU) 710 controlling various processes and configurations, a memory 720 in which operating system programs and various programs (e.g., a battery relay diagnostic algorithm program capable of diagnosing the state of the first switch and the second switch, and a battery switching control program capable of controlling a switch in the battery pack) are recorded, an input/output interface 730 for providing an input interface and an output interface through which data of the battery cell module and/or the switching element, such as voltage, current, and temperature, can flow, and a communication interface 740 capable of communicating with the outside through a wired or wireless communication network.
  • the computer program according to the present disclosure may be recorded in the memory 720 and processed by the microcontroller 710 , so that it may be implemented as a module that performs each functional block illustrated in FIG. 2 .
  • the present disclosure has been described as a structure without the pre-charge circuit in the battery pack; however, the principle applied to the present disclosure is to be applied in the same way even for a battery with a pre-charge.

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  • Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)
  • Protection Of Static Devices (AREA)
US17/626,678 2019-12-20 2020-12-09 Parallel battery relay diagnostic device and method Active 2041-01-17 US11946974B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR10-2019-0172452 2019-12-20
KR1020190172452A KR20210080070A (ko) 2019-12-20 2019-12-20 병렬 배터리 릴레이 진단 장치 및 방법
PCT/KR2020/017934 WO2021125678A1 (fr) 2019-12-20 2020-12-09 Dispositif et procédé de diagnostic de relais de batterie parallèle

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US11946974B2 true US11946974B2 (en) 2024-04-02

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US (1) US11946974B2 (fr)
EP (1) EP3974850A4 (fr)
JP (1) JP7315142B2 (fr)
KR (1) KR20210080070A (fr)
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CN114976506A (zh) * 2022-05-19 2022-08-30 盐城国投中科新能源科技有限公司 一种启动锂电池系统并联装置及其使用方法

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EP3974850A4 (fr) 2022-12-28
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